Automatic stop device



Oct. 27, 1931. F. OBERST AUTOMATIC STOP DEVICE 2 Sheets-Sheet 1 Filed April 27. 1929 '1 F INVESTOR /4 BY w Patented Oct. 27, 1931 UNITED STATES PATENT OFFICE FRANK OBERST, OF'FOSTEBDLALE, NEwlYORx, ASSIGNOR'TO WILBUR PRODUCTS COM- I' ANY, A CORPORATION OF NEW YORK v phonographs.

- AUTOMATIC STOP DEVICE Application filed April 27,

This invention relates to stop devices for It is among the ob ects of the present invention to provide an improved universal U automatic non-set stop which is simple in J construction and operation and which will be efiicient and durable and well designed to meet the demands of economic manufacture, and which is adapted for use with any type of sound record.

7 7 Numerous other objects of the present invention include the novel combination and inter-relation of parts whereby an automatic stop is provided which effectively acts to stop the turntable rotation at the cessation of the playing period regardless of variations of the diameter of the fast portion of the sound groove and regardless of the char acteristies of the spiral or eccentric rapid termination groove.

These and other objects of the present invention will be apparent from a consideration of the following specification and accompanying drawings in which Fig. 1 is a top plan view of one form of my present invention applied to a portable type phonograph and with a portion of the turntable broken away;

Fig. 2 is a view ofthe turntable and stop mechanism just prior to the stopping action;

Fig. 3 is a similar view ofthe stop in operative position; and i p Fig. 4 is a perspective view-of the stop mechanism.

Referring more particularly to Fig. 1 of the drawings, the embodiment of the invention herein disclosed is for convenience illustrated in conjunction with a portable type phonograph, the tone arm 10 and turntable 11 of which are the only features which coact with the stop in the operation of the invention. It is therefore not deemed requisite that a detail description ofconventional associate structure be made. It will be understood that the invention is applicable to many various forms of phonographs and that the invention is not limited to the type here illustrated. A

The stop mechanism includes two inde pendentlymounted associated cooperating 1929. Serial No. 358,454.

parts. An arm 12 mounted at the base of the tone arm 10'for movement therewith and a depending projection 13 extending from the lower face of the turntable 11 approximately halfway between the center and peripheral edgethereof. The function and operation of the arm 12 and projection 13 will be hereinafter described. It will be understood that their configuration as well as the configuration and design of associated parts mayun- 'dergo various changes without departing from the spirit or scope of the appended claims.

Referring to the main portion of the. stop mechanism illustrated in perspective in Fig. 4, the same includes a base 14 securable to the motor board of a phonograph by threaded securing members 15 as shown in Fig. 1. The

body 14-is preferably of flat sheet metal and i 17 The opposite end of the body is wider and 7 includes upwardly bent stop detents 18 and 19 oppositely disposed and rising from the sides of 'thebody. The end of the body is provided with a spring securing projecting support 20 adjacent to which a brake pivot 21 is provided. Intermediate the ends of the body a pivot 22 is provided for the actuatingarm23. I

The actuating arm 23 is centrally pivoted upon the pivot 22 and includes an inwardly extending arm 24 terminating in a triangular projection engaging head 25 and a brake-engaging arm 26 terminating in an angularly disposedibrake contacting surface 27. Adj acent the pivoted portion of the arm 23 there is provided a controller carrying arm 28 terminating in a headed controller pin 29, which extends through an elongated aperturein the inner end of the controller 30.

The controller 30 is mounted jointly on the mechanism as will be herein described.

The mechanism is completed by the provision of a pivoted frictional brake 35 which is pivoted to the body li by the pivot 21 and which includes a disc engaging flange 36 upon which is secured suitable friction material 37 and. an oppositely disposed handle 38 together with an actuator flange 39 to which a spring 40 is secured and extends to the securin g flange 20.

In the operation of the device the normal at rest position of the tone arm, turntable and stop mechanism is shown in Fig. 1. In this position the arm 12 is out of engagement with the fingers 33 of the controller 30. The controller is in inward position with respect to the body 1 1 and the arm 23. The arm 23 is in clockwise rotated position, the stop 18 being against the arm 26 and the brake is in braking position with the flange 36 pressing the material 37 against the inner face of the turntable flange. The position of the brake is maintained by the spring 40 which exerts its tension between the body 14 and brake 35 in a line outside of the pivot 21.

When it is desired to play the instrument, the tone arm is arranged in the usual manner and the brake 35 is rocked about its pivot 21 to disengage the same. This disengaged position of the brake 35 is maintained during the playing period by the change of line of tension by the spring 40 inside the pivot 21 as shown in Fig. 2.

During the intermediate playing operation, the controller 30 is in the position shown in Fig. 1 and so remains till the tone arm approaches the center of the record. In this position of the controller the arm 2.3 is in its clockwise pivoted position, the head 25 being so disposed that the projection 13 passes on the inner face of the head and the stop mechanism retains its inoperative position.

As the tone arm approaches the end of the playing groove, the arm 12 is moved therewith to be received between the fingers 33. No movement of the controller, however, takes place until the final fast groove of the record gives the tone arm a final outward movement.

The final outward movement of the tone arm moves the arm 12 which engages the outer finger 33 to move the controller 30 outwardly on the body 14 and to rotate the arm 23 whereby it will bring the head 25 in a position where the projection 13 will pass on the inner face of the head to further cam the arm 24:, thus counter-clockwise pivoting the arm 23 whereby the projection 27 will strike the brake surface 39 and pivot the brake to its braking position all as shown in Fig. 3.

In considering the structure and its operation it will be seen that the head 25 extends upwardly beyond the plane of the arm 24 whereby after actuation the projection 13 is released to rotate with the turntable. The device may thus be reset by the release of the brake and by the outward movement of the tone arm, which movement replaces the controller 30 by engagement of the arm 12 with the inner finger 33. It will further be seen that the elongation of the apertures 31 and 32 provides for a substantial flexibility of apertures as for instance the final groove may oscillate the tone arm without affecting the setting of the arm 23.

In considering the invention it will be understood that the invention is not confined to design of parts and structural details involved and that numerous changes and modifications and the full use of equivalents may be resorted to without departing from the spirit or scope of the present invention.

Having now described my invention, what I claim and desire to secure by Letters Patent, is

1. An automatic phonograph stop including a brake, a projection on the turntable, a projection movable with the tone arm, and inter-engaging means actuated ointly by said projections to move said brake, said means including a controller engageable at predetermined positions of the tone arm by the projection movable therewith.

2. An automatic phonograph stop includ ing a brake, a projection on the turntable, a projection movable with the tone arm, and inter-engaging means actuated jointly by said projections to move said brake, said means including a controller engageable at predetermined positions of the tone arm by the projection movable therewith and a brake contacting arm associated with said controller, A

3. An automatic phonograph stop including a brake, a projection on the turntable, a projection movable with the tone arm, and inter-engaging means actuated ointly by said projections to move said brake, said means including a controller engageable at predetermined positions of the tone arm by the projection movable therewith and a brake contacting arm associated with said controller and movable to apply the brake by the turntable projection.

4. An automatic phonograph stop including a brake, a projection on the turntable, a projection movable with the tone arm, and inter-engaging means actuated ,jointly by said projections to move said brake, said means including a controller engageable at predetermined positions of the tone arm by the projection movable therewith and a brake contacting arm associated with said controller and movable to apply the brake by the turntable projection, said controller having lost motion connections. to permit limited movement thereof without affecting said brake.

This specification signed this 30th day of March, 1929.

FRANK OBERST. 

